1. 1 Research interests Marc Pirlot Background: Mathematics and Operational Research  MCDA (multi-criteria decision aid) Work done or current (central):  Axiomatization of aggregation procedures (max-min, outranking, …)  Study of conjoint measurement models of preference relations  Study of specific partial order structures (e.g. semiorders) as models of preference  Application of MCDA methods in real cases: choice of road pavement and surfacing, choice of cooling system in power plant, …

2. 2 Less central:  Optimization, metaheuristics  Multiobjective optimization Research interests in connection with Cost Action: Elicitation of preference models  Axiomatized conjoint measurement models (e.g. non- compensatory sorting model of Bouyssou and Marchant)  Theoretical study of optimal exact algorithms for eliciting the parameters of the model (e.g. which coalitions of criteria are sufficient?)  Indirect methods for eliciting (learning) a preference model (e.g. methods based on linear programming like UTA)

3. 3 Network in Belgium:  MathRO (FPMs, Mons): metaheuristics in multiobjective combinatorial optimization; flexible constraint satisfaction  SMG (ULB, Brussels: Y. De Smet, Ph. Vincke): multi- criteria classification, multi-criteria auctions  Th. Marchant, Dept Data Analysis, UGent (delegate for the Flemish part of Belgium): voting theory, measurement theory  B. De Baets, Dept Applied Math., Biometrics and Process Control, UGent: modelization of imprecision and uncertainty in intelligent knowledge based systems, fuzzy sets, fuzzy preferences